According to Amazon, Aurora and Belle are the next princesses to make an appearance on the Disney Jr show Sofia the First.

Sofia the First: All Croaked Up(This book will be released on August 13, 2013.Sofia is chosen to sing the Enchancian Anthem at the annual Harvest Festival. After she becomes a bit too boastful, Sofia's magical amulet bestows a curse on her, leaving her all croaked up! Based on a special episode featuring Princess Belle airing on Disney Junior in September 2013!

Sofia the First: Holiday in Enchancia (This book will be released on September 10, 2013.)A snowstorm prevents King Roland from returning home in time for the holidays. Sofia leads her family on a brave expedition to find him, and shows Amber that spending the holiday with loved ones is better than any present. This festive storybook includes sparkly holiday stickers and a special appearance by Princess Aurora! Based on a special episode airing on Disney Junior in December 2013!